[GitHub] duhengforever commented on issue #575: while not use FileChannel.write()? rocketmq use mmap file write , may cause use a lot of share memory

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duhengforever commented on issue #575: while not use FileChannel.write()? rocketmq use mmap file write , may cause use a lot of share memory 
URL: https://github.com/apache/rocketmq/issues/575#issuecomment-444446833
 
 
   @Ah39 Compared with FileChannel, MMAP can write to the page cache directly, but FileChannel and use directbuffer need to write to  memory first, then write to the page cache. so RocketMQ has an advantage when writing a lot of small data into a file. 
   

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